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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b870b68db485eeabd0bccb9215a331335843cd38b6b9a469586a41dd8520f56a' 
  AND token = 'R+IEet04QzIFt8TZo/c9ynqG9s9hEKVXtgB2nXUNJr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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