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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f8748680f2712a60db11c55f822d4a0d46762fa9c29db6f19d66fd6ef8e4e2' 
  AND token = 'gi0Z+pAnMA10d12eSjprWQIVCqhcG4QVJAyi7DGYppc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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