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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d4fc7e6e27fece4e88516ec217bd506a6d3e32f94e49dfb6232943a503839e' 
  AND token = 'TEVEKyZWRgd0pW1sD4a8nrPkTY8VerPsnGyxeo/xYUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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