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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae02056217acec3d632b98fd1f8e60d54fdc9edbc84cdb305b30f9e3af91d708' 
  AND token = 'oYncCkK2hC6tW8WMDNvjZ3EK2Xz/n02qqI+y5UvpS1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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