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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b966a1367192223fb0a16178f0a62552adcea37da92b082d8271279f19d863b' 
  AND token = 'EHiOEeozECdEkppEL28Unv/3orbr4yZKbsM3Oqqzmi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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