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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491b0651c2962a0cc431ac0d2962ed3242fa841049ef5767ddcf791aba137693' 
  AND token = '6WBLswQVXJdPFFGyy0oTZPwkHrQ5nuKN7SfvNNzEq2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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