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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2e15568c594783fd17df4dbe72e1eca5b753061c3327dd2a8146f0f180bba8' 
  AND token = 'wsoRR/6QPab2lsHoGRIb7iedtMcZ16oO0WdgA7+AT1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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