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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6687054096a1adda70d6e4c8b1a45f8493c6db9a23422029a4580156ed8a292' 
  AND token = 'gigaQhnKMcF7PlOXmXF0Xm38dnXpi9C00uzxyQM6nJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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