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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d35906dda9861af17a9322653069b16afea50843ee37b074bebb7978678525b' 
  AND token = 'uLPE34j82I8x8eQvGlwY47Ez+p0RJ02AB+aJgDUYufQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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