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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad4a569c83c1371ebc7dfc90eef17f4b5c2cba4f703f26da56066902a7a54b8' 
  AND token = 'XgsokVxMTShmaH8/BWcabmRl/sD0Dtq350jRmzTFIG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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