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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157bd235690ed0adf91092acc1fe4dac9ea421427342908bd9eef6d9a0bf7dc1' 
  AND token = 'BSvYFwIWSQstbpilT3BEBxh/6DvFuapt2HS4lx1tsPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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