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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672b566d8ef43cd01b572ec8c16f285f51c46c56e380145e166e4b36de776dfc' 
  AND token = '1l2og04oWDFvWW4LHBMHjzEljOYe2bJh0OewFJm1Kl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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