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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9896990d41689e3f9339c9c8e9638621b104f32a3f337d37d60e58377fc8eb9' 
  AND token = 'VoAcD2LS54uKWof0mWq2OAJZUW3dSoj4Ah9DeynJ8Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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