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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bb524188be75e694cd90874d29f950dfc15308d65c7de8cc8486ba6ec24f6d' 
  AND token = 's/NkMxeww0RcPOPYJVu2DWMJNYsQnXN2tFTjTqVMtB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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