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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50acae07d27fcccadfbf644f51f97fe2cccc26e760ba7c2656de47972618e66' 
  AND token = 'dQVKNBSU63gLPw6fdTCR4gJk1DdIhCqSyJNPrsakKBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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