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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb968819c959b3c88b3a07b5735f8eea72934cff44f874254d7a664e3fd6b98' 
  AND token = '6bRPqPOSjt4moUzmdEY4crB4vMRi9TL2sr26gvawlX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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