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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e63774009775d3dfb92e58f26dd068c0b4de9dde3a3548e5f0578a24c34588' 
  AND token = '705v0LvAtCkbVFYXBp6OOSus6wSZqc6P9c8Lw6Iz/nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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