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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6508be7b019c1a3a398bb4bfad5fc8632fd1c270478f8a4994134c625c5c4d03' 
  AND token = 'n6A6cc2x4JQdr0YNZ1gUycp74KdgjX7ZZac6WKGN1fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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