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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd0d6988d861027aae805b564b8a2ef5dc17bdfc9d3eac5b1c258b257fb4d13' 
  AND token = 'DSYa5PXi/dnJd1vLnWD5q8rI25f0BreHpaDl/Dc9lmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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