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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e1ee29839e3e32cac368227c78b9bfdc52906c59101e22a5d46f2ea4ab2d82' 
  AND token = '9pq31IlDhnbzKCO/SF4sC0dTEDvgN1up+4zjiVy8X7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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