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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e788a72a4b643c8e83664105cf44ba0de64a92d3f33d59467ca4dc8f8a83003' 
  AND token = 'bCCEJUuojVJk5P+fS4BhaNIglS51dWFUJH3Abe8XB1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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