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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c542e95e0cc9e98685a2246b8119b9a9cb5bbf22d61375a3b7fae302d38461' 
  AND token = 'yRqXm9ZH4sTOeJzJT1XSzMFr4Rm4ZjwvlbifnJ0X7XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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