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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3662a53f2ce7b2cef1054e96d98a5d5bed3e28f11e4266e2c5f9a51f22e5ce' 
  AND token = 'buKfuY5PBkaeAAeE8nmJiSs+rVsLKxtNWmOL3V6J98g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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