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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead8f0878cb7dae549ed0990949f4d9302e32ef2fefcdb58b44ab301545d9fd7' 
  AND token = 'qQ2ga2ZNfzA7f/9jOicdNZSDYn+tlrVa3dx1lJyvRFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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