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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098a48e55287c94e441cc50427ea7d4f61a05eee108f53e0be82df087eb61100' 
  AND token = 'aG1RLtlS93/oQG8BFt3W08MI9f7A+e+CTuhh1/IKowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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