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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0003aecdca1a4bb76067fa93e8ab22a85ea3ad5d89fd15c11e57803e58c7f379' 
  AND token = '6FfF6+Vj50LXOn2V7MxR0Owmvhu5q+2OrazqclXbtT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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