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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ab75ec0d21ffa2a091e3de4793c1b319e3cd4163fd12a5c77222043cf867ae' 
  AND token = 'wcIVhfttuL0z+K31cOkDVAqBKLi3n92QgrTAifYMNlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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