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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0369f6e45f7f9db7ac25076a0fd9beb9818989e3a68eb534adf911cf66f63d82' 
  AND token = 'gT6W+VdeZ6MaZ38A5X2jMM3e+om2R6c+znB2ewLZK/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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