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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9bb71eaf91ac6657b9ad470a4b549998d62aaa263043733e091523b8d70bd1' 
  AND token = 'Ogmm1vqbB73BE5A8wH0pk3z1gdz1ApNfjFttecr0wKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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