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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a58395d96f24f8cefbe0875ae9ae340cd01bc07b3f611c594770290d5d18e72' 
  AND token = 'wbp2nPURxlekU3/mni2w756ydk/uKEUXHg8WSNUqd4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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