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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f09643330aa5eaf560f8ae76657977440b0f0cf435f5f9fe8c025f790efca4a' 
  AND token = 'fraN9FmFiAGyIjkbQmwhrg5yBzYJ8BAarfvx6pgqA9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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