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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2476be7fb6f0511485524ee5fc172de171419b9709e09fea09621b6ded7d7049' 
  AND token = 'auPBa6ioBZAQyfGAYDYbBF/PtaVP53E+yK7rwi6g22c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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