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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32861d9e8baaac10267c5017e3713171ee4186658c7da1273412d72c85a5ba3b' 
  AND token = 'iZKIucipaM9+jpssq7Phg3ZoxhT43hqZSDEwaafYEqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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