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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae07a8905f1c70fe078af3f4a568adbb1e4847143c387d264e214babd68394b' 
  AND token = 'mPaNFsY7mcVe+v62zvH/C1yydZ8sRflclvEqlGPeevY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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