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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5326f99d93362162d3dfef8f8f01fa6467862c568d21fd55a2821a82442a77c' 
  AND token = '4A33HyTZZ/dVYuoikS9TC/UZHj5Vify9ZPEl7pG1HmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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