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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc4a2fa119de7249157d8c8b9a8187eb9d9d925e2dd1eb71971bff56e80653a' 
  AND token = 'LWL8DikKpTs4kCG7ucciFZVxOotEo6JD6bKsM6ddc1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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