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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1e404c9e3283740f2e3cf9a51224d178d7efbd10657d049428f87afa41fdb3' 
  AND token = 'm9527A2I9LwoBpkcB+QpPwC3kTP82okpiU6et9jz0x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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