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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8de6204481c5a0df39189e4d18075d5e12909cc8c357bd387b7db435a231a58' 
  AND token = '6AEtSUNO9giI+b/IXQcoR7CCDxKS3I+Dr+uvoHj551g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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