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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039d4b249c3f0a71066535f8fc2e6116cedecb526483aa7a75a35c2c647ed330' 
  AND token = 'FpuHtBvOSwWjfFxaGZ3H+0U30Vfu9BT5dT/i6x0pKFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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