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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f1ce4477dd85c6062fff5dc9f34bec0341f2aa44af3876b4599276441fcc6b' 
  AND token = 'cd6o2O1d52u1ZQ8W62Sq+HRqMBbbXOcAEnEl3UxbO38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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