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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad05909e8c4c6bf2f32a7a82e3438e4b6be27536662180a438b9122b50c82d1' 
  AND token = '3k8GFMkBddNRgRKy1mu5kHZZq+VtNBIlyllAjvA8qpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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