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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1ce80b331f7a2c5eece82488af5813b1fb221a5f84ebef235ccd91b30bf6e2' 
  AND token = 'NVkrUeYiPdRfpNAo/zcibXJZOp5ytsxa0enEiO0Kk9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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