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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bff99584541f6e91d1b0f74148311c2fc2d52b9c7fa3a4285d565bcb6592630' 
  AND token = 'Zogmr2qoTdYc6eaAJYe3edIG0wc5/4Psv0/OXcxkpJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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