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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5afae27eb453e67e146d599030507fc8ca0fdefa97b3ed866d9cd6d5333be976' 
  AND token = '8csF82Z1ZXYptfhkN6IilSMXbI6ar4fz4XSyyHakaFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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