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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cc26085969b24c3e05468ed0a8efb8358a73f19f73b1a48ea001b3663faffa' 
  AND token = 'O0WBk3qLdTyYPePERy2mR3aNBcraVgmretxCg5PHMks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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