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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855da1eae49dcf2a9c177e03714a0f4e7c24e8e1d9a5a5eafe2ad80ae0aa50bb' 
  AND token = 'ylAYmJWvc5Ny/v90EFKnCnc6Mia9Nc+OPEU6fj4jWdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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