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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1127cb48ae514cef7fbf5e3f48754c9111f7d7efe0236419bfa3d93538c290d3' 
  AND token = 'GpG7RVMdR0aO95EQjDAgCLvFtG6kyFgNbYGSOvfpBlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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