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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6898aaeea6621e252ac6b0b7fccf45c735cfb7ff4238cf102b0d34c5111ac224' 
  AND token = 'yHrLPdl3Ozk4amclzTKcO82L0MTnydUu+DnAKJ5ezEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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