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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92870efa1c120a64f7d95c1e3b3066471300af36003e784e4b7d6dee7647fa87' 
  AND token = 'SyY6xAG8AcdTpQac47fj4lKC4xc9xEx7PC8pOXIycZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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