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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510086a1ff84030ede92082cbba99b4b54db5265fac33b253d5333a51594db73' 
  AND token = 'JVVa1f37MYhTHi6bESWGgtO1ZP6D03TyWe4VJxotvzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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