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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a52c52244f5045c24d7896fa9ace7d193c7691dd4e6db4f4f03a3627ec9d6b9' 
  AND token = 'zlpld44aM1rDMvwoT4uNaJdhpfFQ6wkOZRGtU98T3xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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