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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd94f07985889981da59d628276719594a52b215f8846700694ae1a94f53c3b7' 
  AND token = '8spuVpw9QdeCRVfDcnEz1Fn7yNxT3ummmsXBcXgd4eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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