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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c804e577cc02c381f6416fc1aa5f5ab80f09657a56da169cc29575d0f486b6b9' 
  AND token = '4fQJW8E+xQUZAv4Gl6jH1vw69LPK9vanwW9HOr0ykUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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