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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7347620cfe57c8a230f7b79750236b6df84e6b018b4196f58dadf73501d9bb' 
  AND token = 'NptB+3Wmcmr/gitRw3dsy9x+0cvwS9PUrMWlJ244vLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}