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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c165ada41162555e3ffa2fe2e9843cc550e6c0790475376c1ac0ea77523783' 
  AND token = 'R8eNUyYMOe+/fOYA2P0R5H/KnE2T3n7Dd4vpJRqtSnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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