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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575515fba5cfa901a3d04ae2b2d571b5232ff05b51d438dbd01e322092dc2687' 
  AND token = '+l+YXyfJTNTixiogQ2guy3huex56zgsvhibW0/z9UuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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